Diamond



FIG. 1 is a top and left side perspective view of a diamond, showing our new design;

FIG. 2 is a top and right side perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear perspective view thereof. 

CLAIM The ornamental design for a diamond, as shown and described. 